Standing at the center of the City’s vertical amphitheater, One London is the rare tower that reads as both architectural statement and civic invitation. This is not merely another spire of steel and glass. It is a carefully composed promontory in the sky, open to Londoners and visitors, designed to let the city breathe at multiple horizons, and to place public life, artful structure, and botanical abundance at the very core of a supertall presence.

The City’s Next Defining Silhouette

Recently renamed from 1 Undershaft to One London, the project will begin construction in 2028, with completion planned for 2033. This shift in identity comes with an emphatic statement of scale, a height that will equal the Shard and establish the building as the joint tallest in the capital, a milestone supported by a meticulously reworked design and development program.

One London will rise within the Eastern City Cluster, between the Leadenhall Building and 30 St Mary Axe, on the site of the 1960s Aviva Tower. That structure, also known as St Helen’s Tower, is set for removal, a significant urban act that clears the stage for a new centerpiece in the City’s ensemble of towers.

Architecture with a Civic Heart

The design by Eric Parry Architects is remarkable for the way it unites commercial life and public generosity. The tower is set to reach approximately 309.6 meters and span 74 levels, with a program that balances next generation workplace and exceptional public amenities, including an eleventh floor garden. This elevated landscape creates room to linger among planting while the city’s rooftops unfurl in every direction.

At the summit, the building will host education spaces and a viewing gallery curated and operated in partnership with the London Museum, an inspired commitment that turns the highest reaches of the structure into a classroom with a horizon line for a blackboard. It is an urbane gesture that feels quintessentially London, a celebration of learning, openness, and collective experience far above the streets.

A Crafted Presence, From Ground to Sky

Eric Parry’s approach privileges longevity, performance, and material clarity. Instead of chasing novelty, the design pursues elegance. Vast, slender columns in weathering steel, described as giant redwoods by the architect, meet the ground with surprising lightness, then appear to branch and carry the load upward in a poised arboreal expression. Above, a composition of shaded, planted terraces and a restrained, luminous surface creates a tower that addresses the skyline with composure, not bravado.

This sensibility extends to the arrival. A generous reception volume, conceived as a celebration of entry, invites a gracious flow of people and daylight. The tower reads as a sequence of experiences rather than a single monolith, a vertical campus where nature, craft, and culture find room to breathe.

Green Thinking, At Metropolitan Scale

One London treats sustainability not as an afterthought but as its architectural DNA. The project’s team is exploring leading performance frameworks, including BREEAM and NABERS UK, while its landscape strategy signals an extraordinary commitment to urban ecology, with a reported biodiversity net gain approaching an order of magnitude beyond the current condition. In practical terms, that translates to shaded gardens, layered planting, and hospitable terraces that soften the city’s hard edges and invite life into the sky.

This greening is not only environmental, it is experiential. Sunlight filters through foliage at the eleventh floor, breezes move across planted edges, and the city’s familiar icons appear in new constellations. The building invites you to explore London in chapters, from ground plane to cloud line, and to encounter the metropolis with fresh eyes.

Numbers That Tell a Story

Height and stature. One London will reach approximately 309.6 meters, which will make it the joint tallest building in the United Kingdom, equal to the Shard.
Program and mix. The tower comprises 74 levels, a best in class workplace paired with public amenities that include an eleventh floor garden and the highest bar in London.
Culture at the top. A viewing gallery and learning spaces will be curated and operated with the London Museum, placing education and access at the pinnacle.
Timeline. Construction is scheduled to begin in 2028, with completion anticipated in 2033.
Place in the cluster. The site sits at the heart of the Eastern City Cluster, reinforcing a composition of tall buildings that has become one of London’s most recognizable skylines.

A New Kind of London Lookout

London has long loved its elevated vantage points, from dome galleries to contemporary observation decks. One London advances that tradition with a high altitude realm that has been conceived for everyday life rather than singular spectacle. The viewing gallery is civic in spirit. The bar is social and celebratory. The garden is restorative. Together, these spaces create a layered itinerary that can carry you from a morning of learning with school groups to a twilight toast as the City lights bloom along the river.

Context, Character, Continuity

Behind the scenes stands a seasoned development partnership. Aroland Holdings and Stanhope, working with the City, have positioned One London to serve both as a flexible, high performing workplace and as a proud public facing destination. It is a union of ambition and stewardship, grounded in the belief that the very top of the skyline should give something back.

The tower’s position is symbolic. Framed by the angular poise of the Leadenhall Building and the curved clarity of 30 St Mary Axe, One London will read as both anchor and mediator, a calm vertical accent that completes the cadence of the cluster. From street level, that composition will be felt as a play of thresholds, where colonnades, gardens, and terraces meet the tempo of the City’s lanes and markets. From afar, it will be read as a confident, crystalline line that joins the Shard on the city’s skyline, a pairing that maps the Thames and the Square Mile with complementary peaks.

Why It Matters Now

The past few years have reshaped the conversation about the workplace and the social life of buildings. One London answers with clarity. It proposes a generous ground plane where the daily choreography of arrival feels uplifting. It concentrates wellness and nature in meaningful terraces and gardens. It opens the highest rooms to the public, including young Londoners who will learn their city with a view that extends to the Downs on a clear day. This is the architecture of invitation, not exclusion, and it signals a confident, humanist future for the City’s skyline.

Practical Inspiration for Planning a Future Visit

As the project advances toward its start on site, design details and cultural programming will be refined. The essence is already clear. Expect a thoughtful arrival sequence, an eleventh floor garden animated by shade and texture, a summit where the city is interpreted by the London Museum, and hospitality settings that will quickly become address book staples. Those who love London’s architectural narrative will find in One London a new chapter written with precision and poise, a place that captures the city’s appetite for innovation and its devotion to the public realm.

One London is more than a tower. It is a civic beacon, a vertical promenade, and an affirmation that the world’s great cities still build with imagination and care. When its doors open, the view will be extraordinary. The idea, already, is even better.